Abstract
Ferroelectric lead niobate (PbNb2O6) exists in an orthorhombic phase at room temperature. The fabrication of lead niobate in this ferroelectric form has often been reported to be difficult due to the stabilization of nonferroelectric phases during processing. In this letter, the stabilization of the orthorhombic phase in magnetron sputtered lead niobate films using ‘‘pulsed thermal processing’’ is reported, and various processing factors which influence the destabilization of this phase are discussed. The room-temperature dielectric constant and loss tangent of the resulting films at 1 kHz were 320 and 0.4, respectively. Polarization versus electric-field hysteresis loops showed no saturation, with a remanent polarization of 15 μC/cm2 and a coercive field of 500 kV/cm. The films were highly resistive with a dc conductivity of 1−10 Ω−1 cm−1 at 300 K.
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